Серийный номер диска
	
procedure TForm1.Button1Click(Sender: TObject);
var
  VolumeName,
  FileSystemName     : array [0..MAX_PATH-1] of Char;
  VolumeSerialNo     : DWord;
  MaxComponentLength,FileSystemFlags    : Cardinal;
begin
  GetVolumeInformation('C:\',
                       VolumeName,
					   MAX_PATH,
					   @VolumeSerialNo,
					   MaxComponentLength,
					   FileSystemFlags,
					   FileSystemName,
					   MAX_PATH);
  Memo1.Lines.Add('VName = '+VolumeName);
  Memo1.Lines.Add('SerialNo = $'+IntToHex(VolumeSerialNo,8));
  Memo1.Lines.Add('CompLen = '+IntToStr(MaxComponentLength));
  Memo1.Lines.Add('Flags = $'+IntToHex(FileSystemFlags,4));
  Memo1.Lines.Add('FSName = '+FileSystemName);
end;